[Vol. 2 



706 ANNALS OP THE MISSOURI BOTANICAL GARDEN 



P. fumidiceps. — This species was described by Atkinson 1 

 in 1908, and has not since been reported. Since the writer 

 finds it to be a rather common species in Missouri, and since a 

 description has not appeared in the American literature, a 

 few notes will be appended and the plant described on a fol- 

 lowing page. 



In size and shape the species corresponds most closely to P. 

 chioneus, but it is of a different color and the spores are ellip- 

 soid to subglobose. From P. galactinus and P. caesius it is 

 separated by the almost or quite glabrous pileus and from the 

 latter also by the spores. The writer finds it most often on 

 dead willow logs in willow thickets along river bottoms. The 

 types were described from similar locations. Fresh plants 

 have the same peculiar fragrant odor that is found in P. 



galactinus. 



The following key will aid in the determination of the 



species here discussed : 



Spores cylindric-oblong, often allantoid 



Spores ellipsoid to globose 



1. Pileus villous-strigose; hymenium often bluish or grayish blue. .5. P. caesius 

 Pileus glabrous or very slightly pubescent 2 



2. Hyphae of context simple or very slightly branched; pileus usually tri- 



angular in section; tubes usually 4-9 mm. long 2. P. albellus 



Hyphae of context much branched; pileus usually more applanate; tubes 



1-3 mm. long 1- P- chioneus 



3. Spores 5-G /x in longest direction; plants not fragrant when fresh 4 



Spores 2-4 /m in longest direction ; plants fragrant when fresh 5 



4. Pileus strigose-tomentose or strigose-hispid, especially on the margin; 



tubes collapsing on drying, the mouths equal, small, averaging 3-4 



to a mm 3. P. spumcus 



Pileus glabrous or floccose-tomentose ; tubes scarcely collapsing on dry- 

 ing, the mouths usually somewhat sinuous, averaging 1-2 to a 

 mm Jf. P. delcctans 



5. Pileus glabrous or nearly so 7. P. fumidiceps 



Pileus conspicuously pubescent, often strigose-tomentose at the base. . . . 



6. P. galactinus 



1 

 3 





1. Polyporus chioneus Fries. Plate 24, fig. 13, 16b 



Pileus soft and watery when fresh, rigid when dry, 



2-7 X 1-6 X 0.5-1.5 cm., white, often grayish or yellowish 



when dry, glabrous or nearly so, cove* 



ed 



yellowish pellicle that becomes more evident wh 

 ire dried; context white, usually with a fragra 



»Ann. Myc. 6: P- 61. 1908. 



